On April 16th, MCC Baosteel Heavy Machinery Branch successfully solved the problem of processing ultra-slim trolley bolts in the construction of new export aluminum trough project, which created the necessary conditions for the project to be delivered as scheduled.
The new type of aluminum tank has many different structural forms and product features, one of which is the addition of an adjustable tensioning screw on both sides of the tank. There are more than 100 such screws in total. The specification is M42 double-headed screw, the maximum length of a single piece is 4.4 meters, and for the polished rod part of the screw, the machined surface is required. On the basis of fully digesting the drawings, requirements and acceptance criteria of foreign-related projects, and combining the characteristics of existing machine tools, the heavy-duty machinery branch project team has developed a machining process based on the “multi-section cutting method outside the polished rodâ€, and utilized the project The material is trial-produced.
During the trial production, the operator took measures with the tool holder, effectively controlled the lateral deflection of the elongated rod during the machining process, and also overcome the eccentricity and misalignment problems that are prone to occur in the multi-stage machining work. The implementation of a number of initiatives, supplemented by the timely adjustment of the processing process, explored parameters such as cutting speed, feed rate and knife consumption, and finally formed a reasonable and effective processing method. On this basis, the project team completed the first trial production and inspection of the official product. The results show that the parameters of the sample meet the relevant requirements of the manufacturer, which indicates the success of the product trial production.
According to the usual process classification, machined shaft parts, whose ratio of length to diameter (usually called slenderness ratio) is ≥ 40 times, are processed by slender shafts, the larger the ratio, because of its structure The rigidity is getting worse and worse, it is very easy to produce instability, and the machining is more and more difficult. In this project, the ratio of the slenderness ratio of the largest component has exceeded 100 times, which is a typical ultra-slim shaft machining, which is difficult to process.
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